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Pinterest pops 28% in its Wall Street debut

For years, Pinterest CEO Ben Silbermann has insisted his company is not an outright social network. As he told CNN Business in a recent interview, the platform is not focused on hard news or amassing followers. "At its most basic level, it's just about you," he said.

Uber, Lyft may look the same, but their visions are not

At first blush, it can be hard to tell Uber and Lyft's businesses apart. Both companies offer rides on demand, from a mix of cars, bikes and scooters. They rely on a vast workforce of independent contractors, many of whom drive for both companies. Uber and Lyft even share certain large investors, and now they are going public back to back.